Our fan control will longer change speeds as it runs at a fast speed only.
Most of the time this is a bad "blower motor resistor". It is easy to replace. You will find your behind the glove box in the ac/heater (evaporator) housing. Below is a pic of the resistor as it is seen from behind the glove box. 1. resistor assembly. 2. harness 3. fasteners (2). 4. lower edge of glove box. (open).
You need to replace the blower motor resister located by the blower motor on the heater box.
The 'blower motor resistor' listed above is the failing component. Its not actually a resistor but instead is a small DC power supply controlled by the knob on the climate control. There is a large transistor on the circuit board that is mounted to a large metal heat sync. This transistor shorts out causing full power to be sent to the fan at all times. If you are handy with a soldering iron you can buy this transistor online for about $5 and replace the one on the circuit board.
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